煤矸石烧结自热脱碳活化技术研究
Investigation on activation technology of self-heating decarbonization of coal gangue by a sintering process
鲁胜虎 1潘建 1朱德庆 1郭正启 1李思唯 1石玥 1张武举2
作者信息
- 1. School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China
- 2. School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;Huaihai Industrial Development Group Co.,Ltd.,Huaibei 235000,China
- 折叠
摘要
煤矸石是煤炭开采和选矿过程中产生的固体废物.大规模脱碳和活化处理是实现煤矸石高效利用的关键步骤.本文提出了一种利用煤矸石的热值烧结制备水泥混合材料的新工艺.利用XRD、FTIR、SEM和力学性能分析,研究了不同烧结活化条件下产物的矿物组成、晶体结构和微观结构,揭示了煤矸石的活化机理.试验表明,添加3％的煤和不含返矿制备的活化煤矸石与水泥混合制备的水泥胶砂(活化煤矸石配比为30％)具有最佳的力学性能.此外,用不含煤和返矿制备活化煤矸石的利用系数可达到0.96 t/(m2·h),产品与水泥混合制备的水泥胶砂的力学性能良好.产品分析表明,抽风烧结的热活化能显著提高煤矸石的胶凝活性.过程能耗、生产效率和产品质量的综合评价表明,该技术具有良好的工业应用前景.
Abstract
Coal gangue is a solid waste discharged in coal mining and dressing process.Large-scale decarbonization and activation treatment are key steps toward massive and efficient utilization of coal gangue.In this paper,a new process for the preparation of a cement admixture from coal gangue by effectively utilizing its calorific value was developed.The mineral composition,crystal structure,and microstructure of the sintered products obtained under different sintering conditions were investigated using XRD,FTIR,SEM and mechanical property analysis to reveal the activation mechanism of coal gangue.The blended cement containing 30%activated coal gangue prepared by adding 3%coal and no return fine exhibited the best mechanical properties.Furthermore,the mechanical properties of the cement containing 30%activated coal gangue prepared without coal and return fine were adequate,reaching a productivity of 0.96 t/(m2·h).The results show that the thermal activation of exhaust sintering can greatly improve the cementitious activity of coal gangue.Finally,the applied technology is promising for industrial application.
关键词
煤矸石/活性/烧结工艺/自热/利用系数Key words
coal gangue/activity/sintering process/self-heating/productivity index引用本文复制引用
基金项目
Fundamental Research Funds for the Central Universities,China(2021zzts0291)
出版年
2023
NETL
NSTL
维普
万方数据